Abstract: Provided is a high-performance PVA fiber and its production.Each filament of the PVA fiber of the present invention having a structure comprising an aggregate of substantially innumerable fibrils, the fiber has high strength, elastic modulus, and resistances to fatigue, hot water and chemicals and can be pulpified while keeping its excellent features such as high strength. The PVA fiber of the present invention cannot, even drawn to a high ratio, be readily whitened by virtue of its fibril-aggregate structure, and can hence be made still higher in performances. The PVA fiber can be obtained by adding to a PVA solution a relatively large amount of surface active agent, and wet or dry-jet-wet spinning the thus prepared dope solution into an aqueous alkaline coagulating bath.

Abstract: A woven mat of oriented elastomeric filaments wherein the filaments are spun from a thermoplastic elastomeric material selected from the group consisting of a block copolymer of polybutylene terephthalate and polytetramethylene glycol, a block copolymer of polybutylene terephthalate/polybutylene isophthalate and polyethylene glycol/polypropylene glycol, a block copolymer of polybutylene terephthalate/polyhexene terephthalate and polytetramethylene glycol, and a block copolymer of polyurethane and polytetramethylene glycol, the mole fraction of the polybutylene terephthalate, polybutylene terephthalate/polybutylene isophthalate and polybutylene terephthalate/polyhexene terephthalate in the block copolymers is less than 0.5, the elastomeric filament is further oriented after the spinning by stretching at temperatures between 20.degree. C. to 120.degree. C.

Abstract: Batts and filled articles of polyester fiberfill of round peripheral cross-section, but containing voids arranged peripherally around an axial void, and preferably seven such voids in a hexagonal packing arrangement.

Abstract: An alumina fiber structure of a flat shape composed of alumina fibers having an alumina content of at least 65% by weight, the majority of said fibers being oriented substantially in parallel with the flat surfaces of the structure, and a number of fiber strands composed of the same alumina fibers extending inwardly from the flat surfaces of the structure, said structure having a thickness of from 4.8 mm to less than 10 mm, a density of from 0.07 to 0.3 g/cm.sup.3, a tensile strength of at least 0.5 kg/cm.sup.2 and a peeling strength of at least 0.5 kg/m.

Abstract: Two-component loop sewing yarn composed of core and effect filaments of high tenacity and low shrinkage made of synthetic polymers, having an ultimate tenacity of above 40 cN/tex, a thermoshrinkage at 180.degree. C. of below 8% and an ultimate tensile strength elongation of below 18%, has a total count of 200 to 900 dtex, its core filaments and effect filaments being in a weight ratio of 95:5 to 70:30 with the linear density of the core filaments being 8 to 1.2 dtex and that of the effect filaments being 4.5 to 1 dtex.

Abstract: A polyamide yarn having on the surface of the polyamide yarn a hydrophobic organic ester dip penetration regulator having a melting point greater than 27.degree. C. and convertible by conventional means into a tire cord having low stiffness and high air permeability and a process for making polymeric tire yarns is disclosed.

Abstract: Oriented, shaped articles such as films or fibers of para-aramid/meta-aramid blends which ar useful for the manufacture of para-aramid pulp, a process for making such articles and a pulp-making process are disclosed.

Abstract: This invention provides an electromagnetic wave absorbing material composed of a composite material comprising a fiber having a specific resistance of 10.sup.-2 to 10.sup.2 .OMEGA..cm and a matrix, wherein the fiber is composed of an inorganic substance selected from the group consisting ofi) an amorphous substance substantially composed of Si, M, C and O,ii) crystalline ultrafine particles substantially composed of .beta.-SiC, C, MC, a solid solution of .sym.-SiC and MC and/or MC.sub.1-x, and having a particle diameter of not more than 500 .ANG., or optionally, an aggregate of the crystalline ultrafine particles, amorphous SiO.sub.2 and amorphous MO.sub.2, andiii) a mixture of the above i) amorphous substance with the above ii) crystalline ultrafine particles or aggregate in which M denotes Ti or Zr, and X is more than 0 but less than 1.

Abstract: The present invention relates to a new and useful composite fiber. The composite fiber is comprised of non-organic particulates bound to an organic polymer in fiber form. Many non-organic substances are serviceable and valve metal oxides are highly suitable. The organic polymer fiber is advantageously derived from fluorine-containing polymer. The composite fibers can serve as a filter, for instance as a filter-packing material for column chromatography, or can be suitable for separations, e.g., battery separations. The fiber may be compressed, or compressed and sintered, and thereby be useful as bearings or gaskets.

Abstract: A high strength and high initial modulus polyvinyl alcohol monofilament yarn and a process for producing the same with high productivity are disclosed, the monofilament yarn comprising polyvinyl alcohol having a polymerization degree of from 1500 to 7000, having a tensile strength of not less than 10 g/d and an initial modulus of not less than 200 g/d, and having a fineness of 100 denier or more; and the process comprising dry-wet spinning a spinning dope prepared by dissolving polyvinyl alcohol having a polymerization degree of from 1500 to 7000 in a solvent and stretching the resulting unstretched filament, wherein a plurality of filaments immediately after being spun from a spinning nozzle having a plurality of orifices are closely adhered and united into a substantially single strand in an inert atmosphere and then introduced into a coagulating bath or a cooling bath.

Abstract: In a polymer composite containing reinforcing fibers, improved EMI shielding is provided by positioning conductive fibers in the composite as discrete, spaced apart layers.

Abstract: Fibers useful as surface materials for paper diaper, napkin for menstruation, etc. are provided, which fibers comprises a polyolefin or a polyester having a mixture of (A) a fatty acid diethanolamide, (B) a polyether-modified silicone, (C) a sorbitan fatty acid ester and (D) a metal salt of an alkylsulfonate in mixing proportions of (A): 30-60%, (B): 20-55%, (C): 10-25% and (D): 5-10%, each % by weight based on the mixture, adhered onto the surface of fibers comprising a polyolefin or a polyester, in 0.2-1.0% by weight based on the fibers.

Abstract: Provided is a composite fiber comprising an ethylene-vinyl alcohol copolymer and a thermoplastic polymer. The composite fiber is acetalized with a dialdehyde such that the ethylene-vinyl alcohol copolymer has a melting point in a specified range, whereby the composite fiber does not cause serious stickings between the filaments when dyed, sewn or ironed and is excellent in hydrophilic property, resistance to soiling, antistatic property and the like. The composite fiber is thus very suitable for clothing use.

Abstract: It has been found that the properties of poly(vinyl chloride) based polymers are substantially enhanced through the use of a specific plasticizer system. In particular, the use of specific triarylphosphates in combination with specific diarylphosphates in specific proportions not only plasticizes the PVC polymer but produces a transparent, flame retardant heat resistant, easily worked polymer. These materials are used so that the diarylphosphate is 30-45% of the total concentration of the phosphates and such that 45 to 70 parts of the phosphates are present per 100 parts of the polymer.

Abstract: The cellulosic hollow-fiber membranes of the invention are useful in fluid processing apparatus typically for artificial dialysis. Each fiber has a tubular microporous wall having micropores and defining a lumen. The micropores have an average pore diameter of about 55 to about 300 .ANG.. The cellulosic hollow fibers exhibit a percent removal of .beta..sub.2 -microglobulin through adsorption of up to 10% after a solution of 20 mg/l of .beta..sub.2 -microglobulin in water is circulated through the fiber lumen for 3 hours. They also exhibit a sufficient filtration fraction of .beta..sub.2 -microglobulin and a ultrafiltration rate to remove .beta..sub.2 -microglobulin from blood predominantly through filtration while preventing contamination of the membranes with .beta..sub.2 -microglobulin due to adsorption and controlling the amount of water removed from the blood.

Abstract: A carbon fiber-reinforced carbon composite material having a porosity of not higher than 20% prepared by subjecting a carbon fiber-reinforced carbon composite material having a porosity of from 25 to 95% to densification treatment, wherein the densification treatment is conducted with pyrolytic carbon formed by the pyrolysis of a halogenated hydrocarbon-containing gas at a temperature of from 400.degree. to 800.degree. C.

Abstract: A polyamide yarn is disclosed which is at least 85% by weight poly(hexamethylene adipamide) and which has a relative viscosity of greater than 50, a tenacity of at least about 9.5 g/d, a modulus of at least about 30 g/d, a shrinkage at 160.degree. C. of less than about 2 percent, a crystal perfection index of greater than about 83, and a long period spacing of greater than about 105 .ANG.. The process for making the yarn includes drawing of a feed yarn while heating to at least about 190.degree. C. in at least a final draw stage to a draw tension of at least 3.8 g/d, subsequently decreasing the tension while heating to at least about 190.degree. C. to produce a length decrease of between about 13.5 and about 30%, and cooling and packaging the yarn.

Abstract: Disclosed herein are a polyamide filament comprising a polyamide resin composition which comprises an aromatic polyamide resin (A) produced by polymerizing a monomer containing not less than 85 wt % of an aromatic polyamide component composed of terephthalic acid, isophthalic acid and aliphatic diamine, and an aliphatic polyamide resin (B), and having a heat-shrinkage in boiling water of not less than 20%, and a process for producing the same.

Abstract: This invention is directed to a thermal barrier layer particularly adapted for insulating a solid flowable particulate polymeric pressure transfer medium from elevated temperatures during high temperature molding. A method useful with the thermal barrier comprises transferring pressure from a pressure means via the thermal insulation layer to an article and exposing the article to temperatures of about 316.degree. C. to about 1371.degree. C. An exemplary thermal barrier comprises at least two flexible layers of beads having a thermal insulation of less than about 2 k.

Abstract: A process for producing high tenacity nylon yarn is described. The process comprises a melt-spinning step for producing an as-spun yarn, a solid state polymerization step for increasing the Mw and changing the crystalline characteristics of the nylon polymer of the as-spun yarn, and a drawing step for increasing the tenacity of the yarn.